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Center for Education and Research in Information Assurance and Security

Firewalls as an Internet Security Tool

Christoph Schuba - PhD Candidate, Purdue University

Sep 09, 1994


The current level of security in the Internet seems secure only to the
totally oblivious. One practical action to guard security domains
against untrusted networks is the physical separation of the
demilitarized zone from the rest of the Internet, allowing only a few
dedicated machines to transmit data between them according to
established policies: firewall routers.

Determining a suitable network topology and configuration of firewalls
is a process that includes the definition of a security policy, a
formal description of allowed and denied traffic in terms of a logical
expression of packet fields, and its implementation. Purpose,
topologies, capabilities, and limitations of firewalls are worth
examining, as well as how firewalls work in the presence of vital
Internet services.

There are some currently open questions including the
integration of firewall technology with emerging information and
multimedia services, windowing systems, formal specification
of filtering rules, and the presence of gigabit networking.

Unless otherwise noted, the security seminar is held on Wednesdays at 4:30P.M. STEW G52 (Suite 050B), West Lafayette Campus. More information...


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